CN101784796A - System for controlling capacity of variable capacity compressor and display device - Google Patents

System for controlling capacity of variable capacity compressor and display device Download PDF

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Publication number
CN101784796A
CN101784796A CN200880104076A CN200880104076A CN101784796A CN 101784796 A CN101784796 A CN 101784796A CN 200880104076 A CN200880104076 A CN 200880104076A CN 200880104076 A CN200880104076 A CN 200880104076A CN 101784796 A CN101784796 A CN 101784796A
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China
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pressure
variable displacement
displacement compressor
suction pressure
unit
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CN200880104076A
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CN101784796B (en
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田口幸彦
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Sanden Corp
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Sanden Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/14—Control
    • F04B27/16—Control of pumps with stationary cylinders
    • F04B27/18—Control of pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
    • F04B27/1804—Controlled by crankcase pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H1/3204—Cooling devices using compression
    • B60H1/3205—Control means therefor
    • B60H1/3208—Vehicle drive related control of the compressor drive means, e.g. for fuel saving purposes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H2001/3236—Cooling devices information from a variable is obtained
    • B60H2001/3248—Cooling devices information from a variable is obtained related to pressure
    • B60H2001/325—Cooling devices information from a variable is obtained related to pressure of the refrigerant at a compressing unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H2001/3236—Cooling devices information from a variable is obtained
    • B60H2001/3255—Cooling devices information from a variable is obtained related to temperature
    • B60H2001/3261—Cooling devices information from a variable is obtained related to temperature of the air at an evaporating unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H2001/3236—Cooling devices information from a variable is obtained
    • B60H2001/3266—Cooling devices information from a variable is obtained related to the operation of the vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H2001/3269—Cooling devices output of a control signal
    • B60H2001/327—Cooling devices output of a control signal related to a compressing unit
    • B60H2001/3275—Cooling devices output of a control signal related to a compressing unit to control the volume of a compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/14—Control
    • F04B27/16—Control of pumps with stationary cylinders
    • F04B27/18—Control of pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
    • F04B27/1804—Controlled by crankcase pressure
    • F04B2027/1822—Valve-controlled fluid connection
    • F04B2027/1827—Valve-controlled fluid connection between crankcase and discharge chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/14—Control
    • F04B27/16—Control of pumps with stationary cylinders
    • F04B27/18—Control of pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
    • F04B27/1804—Controlled by crankcase pressure
    • F04B2027/184—Valve controlling parameter
    • F04B2027/1854—External parameters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/14—Control
    • F04B27/16—Control of pumps with stationary cylinders
    • F04B27/18—Control of pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
    • F04B27/1804—Controlled by crankcase pressure
    • F04B2027/184—Valve controlling parameter
    • F04B2027/1859—Suction pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/14—Control
    • F04B27/16—Control of pumps with stationary cylinders
    • F04B27/18—Control of pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
    • F04B27/1804—Controlled by crankcase pressure
    • F04B2027/1863—Controlled by crankcase pressure with an auxiliary valve, controlled by
    • F04B2027/1872—Discharge pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/07—Details of compressors or related parts
    • F25B2400/076—Details of compressors or related parts having multiple cylinders driven by a rotating swash plate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/19—Calculation of parameters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/026—Compressor control by controlling unloaders
    • F25B2600/0262—Compressor control by controlling unloaders internal to the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2521—On-off valves controlled by pulse signals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/17—Speeds
    • F25B2700/171—Speeds of the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/17—Speeds
    • F25B2700/173—Speeds of the evaporator fan
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1931—Discharge pressures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2104—Temperatures of an indoor room or compartment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2106—Temperatures of fresh outdoor air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2117—Temperatures of an evaporator
    • F25B2700/21171—Temperatures of an evaporator of the fluid cooled by the evaporator
    • F25B2700/21173—Temperatures of an evaporator of the fluid cooled by the evaporator at the outlet

Abstract

A system for controlling the capacity of a variable capacity compressor comprises target suction pressure setting means for setting a target suction pressure according to external information from external information detecting means by using the pressure in a suction pressure range as the controlled object, suction pressure estimating means for estimating the suction pressure on the basis of the external information while the variable capacity compressor is operating with a maximum discharge capacity, and discharge capacity judging means for judging whether the variable capacity compressor is operated with a maximum discharge capacity or with a controlled discharge capacity on the basis of the estimated suction pressure and the preset target suction pressure.

Description

The capacity control system of variable displacement compressor and display unit
Technical field
The present invention relates to a kind of capacity control system and display unit that is applied to the variable displacement compressor in the air-conditioning system.
Background technique
The reciprocating motion type variable displacement compressor that for example is used in the automotive air conditioning system comprises shell, and enclosure is divided to be formed with and discharged chamber, suction chamber, crank chamber and cylinder thorax (cylinder bore).Can swash plate be arranged the binding of banking motion ground on the live axle that in crank chamber, extends.Comprise that the shifting mechanism of swash plate becomes to be disposed at the to-and-fro motion of the piston in the cylinder thorax with the rotation transformation of live axle.The to-and-fro motion of piston is carried out from suction chamber and is sucked the inhalation process of working fluid, the compression section of working fluid after sucking and the working fluid after the compression to the discharge operation of discharging the chamber discharge in the cylinder thorax.
The stroke of piston is long, be that the discharge capacity of compressor can change by the pressure (pilot pressure) that makes crank chamber and variable, be control discharge capacity, in being communicated with the air feed path of discharging chamber and crank chamber, dispose capacity control drive, in the path of bleeding that is communicated with crank chamber and suction chamber, dispose throttle valve.
Suction pressure control is arranged in the control of the capacity of discharge.In order to carry out suction pressure control, in the capacity control drive that has, be built-in with the pressure-sensitive parts of the pressure (suction pressure) that is used for the perception suction chamber.In the variable displacement compressor that uses such capacity control drive, suction pressure is mechanically carried out feedback control (suction pressure control) by the pressure-sensitive parts, with the approaching suction pressure of setting.
In more detail, the pressure-sensitive parts for example are made of bellows or barrier film.Under the situation of the pressure-sensitive parts that use bellows, remaining the inboard configuration compression helical spring of vacuum or atmospheric bellows, suction pressure acts on an end of bellows from the outside.Therefore, the bellows as the pressure-sensitive parts can extend along with the minimizing of suction pressure.
The spool of capacity control drive is configured to act on solenoidal electromagnetic force and extends and the pressing force of generation as the bellows desire of pressure-sensitive parts.And, be under certain situation to solenoidal energising amount, the aperture of capacity control drive changes, and makes suction pressure be stable at corresponding with the energising amount and setting suction pressure that determine.
And document 1 (Japanese patent laid-open 10-38717 communique) discloses the method for the torque that detects the variable displacement compressor in the suction pressure control.According to document 1, according to the torque that the solenoidal energising amount and the extraneous gas temperature of capacity control drive are calculated variable displacement compressor.The torque of the variable displacement compressor that calculates is used to the engine speed control of vehicle.
In suction pressure control, decide solenoidal energising amount (capacity control signal) herein, to capacity control drive based on setting suction pressure.Compare highly when a certain amount of in the suction pressure of reality with setting suction pressure, if the energising amount of decision is provided, then the discharge capacity of variable displacement compressor becomes maximum value sometimes.
This maximum value is that the inclination that is transformed the swash plate of mechanism reaches the limit of such mechanical constraint decision.If the discharge capacity becomes maximum value,, the discharge capacity is further increased even then adjust to solenoidal energising amount certainly.However, surpassed the discharge capacity becomes maximum energising amount (maximum capacity energising amount) in the past, switches on to solenoid.This is owing to do not consider that the maximum value of discharge capacity has mechanical constraint, makes decision in the situation of only considering the setting suction pressure and causes to solenoidal energising amount.
Surpass maximum capacity energising amount when solenoid is switched on, to of the relevant disappearance of solenoidal energising amount with the torque of variable displacement compressor.If so relevant the disappearance, the accurate calculating torque of the torque detecting method of the variable displacement compressor of document 1 then.
As a result of, for example when vehicle idling moved, it is unstable that the control of engine speed might become, and produces engine misses.
In addition, if can not accurately calculate, then be difficult to reach the purpose originally that variable displacement compressor is used for air-conditioning system to the torque of variable displacement compressor.This purpose is meant that as a ring of global warming countermeasure, the consumption of power of cutting down air-conditioning system and vehicle realizes energy-conservation.
Summary of the invention
First purpose of the present invention is to provide, can judge variable displacement compressor be in maximum discharge the capacity status running, or with the operating condition of discharging the such variable displacement compressor of volume controlled state running, the capacity control system of variable displacement compressor.
Second purpose of the present invention is to provide, and comprises variable displacement compressor and discharges the situation of capacity status running with maximum, can calculate the capacity control system of variable displacement compressor of the driving load of variable displacement compressor all the time accurately.
The 3rd purpose of the present invention is to provide, and can carry out the capacity control system of the variable displacement compressor of suction pressure control with simpler structure.
The 4th purpose of the present invention is to provide, and can make its vision ground identification by the driving load that calculates to the user, and the result can help to improve the display unit to the environmental consciousness of air-conditioning system.
For reaching described purpose, according to first invention, a kind of capacity control system of variable displacement compressor is provided, described variable displacement compressor is for constituting the refrigeration cycle and the radiator of air-conditioning system, expander and vaporizer press from both sides the circulation road that inserts in for refrigerant cycle together, and capacity is based on the variation of pilot pressure and change, pressure with the described refrigeration agent of the random position of the discharge pressure region of described refrigeration cycle is head pressure, and the pressure with the described refrigeration agent of the random position in the suction pressure zone of described refrigeration cycle is suction pressure, comprise: capacity control drive, described capacity control drive can be by changing described pilot pressure to adjust the capacity of described variable displacement compressor; External information detection unit, described external information detection unit are used to detect the external information 1 or more relevant with described refrigeration cycle; And target suction pressure setup unit, described target suction pressure setup unit is based on by the detected external information of described external information detection unit, the pressure in described suction pressure zone is come the target setting suction pressure as controlling object, described pilot pressure is changed adjust from the discharge capacity of the refrigeration agent of described variable displacement compressor discharge, so that the pressure in described suction pressure zone becomes described target suction pressure, the capacity control system of described variable displacement compressor is characterised in that, comprise: suction pressure is inferred the unit, described suction pressure is inferred the unit based on by the detected external information of described external information detection unit, infers at the pressure of described variable displacement compressor with the described suction pressure zone under the state of maximum discharge capacity action; And the capacity of discharge identifying unit, described discharge capacity identifying unit is based on pressure of being inferred the described suction pressure zone of inferring out the unit by described suction pressure and the target suction pressure that configured by described target suction pressure setup unit, judge that described variable displacement compressor is that still described variable displacement compressor moves with controlled discharge capacity with the action of maximum discharge capacity.
According to second invention, a kind of capacity control system of variable displacement compressor is provided, it is characterized in that, described discharge capacity identifying unit compares the pressure of being inferred the described suction pressure zone of inferring out the unit by described suction pressure, the target suction pressure that is configured by described target suction pressure setup unit, when the pressure of being inferred the described suction pressure zone of inferring out the unit by described suction pressure is higher than the target suction pressure that is configured by described target suction pressure setup unit, is judged to be described variable displacement compressor and moves with maximum discharge capacity; When the pressure of being inferred the described suction pressure zone of inferring out the unit by described suction pressure is lower than the target suction pressure that is configured by described target suction pressure setup unit, is judged to be described variable displacement compressor and moves with controlled discharge capacity.
According to the 3rd invention, a kind of capacity control system of variable displacement compressor is provided, it is characterized in that, in described target suction pressure setup unit, described target suction pressure is come setting threshold as benchmark, in described discharge capacity identifying unit, pressure of being inferred the described suction pressure zone of inferring out the unit by described suction pressure and the threshold value that is configured by described target suction pressure setup unit are compared, when the pressure of being inferred the described suction pressure zone of inferring out the unit by described suction pressure is higher than the threshold value that is configured by described target suction pressure setup unit, is judged to be described variable displacement compressor and moves with maximum discharge capacity; When the pressure of being inferred the described suction pressure zone of inferring out the unit by described suction pressure is lower than the threshold value that is configured by described target suction pressure setup unit, is judged to be described variable displacement compressor and moves with controlled discharge capacity.
According to the 4th invention, a kind of capacity control system of variable displacement compressor is provided, it is characterized in that, in described target suction pressure setup unit, described target suction pressure is come capping threshold value and lower threshold as benchmark, in described discharge capacity identifying unit, pressure of being inferred the described suction pressure zone of inferring out the unit by described suction pressure and the described threshold value that is configured by described target suction pressure setup unit are compared, when the pressure of being inferred the described suction pressure zone of inferring out the unit by described suction pressure is higher than the upper limit threshold that is configured by described target suction pressure setup unit, is judged to be described variable displacement compressor and moves with maximum discharge capacity; When the pressure of being inferred the described suction pressure zone of inferring out the unit by described suction pressure is lower than the lower threshold that is configured by described target suction pressure setup unit, is judged to be described variable displacement compressor and moves with controlled discharge capacity.
According to the 5th invention, a kind of capacity control system of variable displacement compressor is provided, it is characterized in that, under the pressure of being inferred the described suction pressure zone of inferring out the unit by described suction pressure is in situation between described upper limit threshold and the described lower threshold, in described target suction pressure is to be set in decision content between described upper limit threshold and the described lower threshold when above, and described discharge capacity identifying unit is judged to be described variable displacement compressor and moves with maximum discharge capacity; During less than described decision content, described discharge capacity identifying unit is judged to be described variable displacement compressor and moves with controlled discharge capacity in described target suction pressure.
According to the 6th invention, a kind of capacity control system of variable displacement compressor is provided, it is characterized in that, make described decision content variable according to external information, described external information is detected by the rotation speed detection unit of the described external information detection unit of conduct of the physical quantity of the speed of a motor vehicle detection unit of the described external information detection unit of conduct that detects the speed of a motor vehicle and/or the rotating speed that detection is equivalent to described variable displacement compressor.
According to the 7th invention, a kind of capacity control system of variable displacement compressor is provided, it is characterized in that make described decision content variable according to external information, described external information is detected by the thermal load detection unit as described external information detection unit.
According to the 8th invention, a kind of capacity control system of variable displacement compressor is provided, it is characterized in that, described suction pressure is inferred the unit and is inferred the pressure in described suction pressure zone based on external information, and described external information is detected by the head pressure computing unit of the described external information detection unit of conduct of the pressure of the discharge pressure region of calculating described variable displacement compressor, described thermal load detection unit, described rotation speed detection unit.
According to the 9th invention, a kind of capacity control system of variable displacement compressor is provided, it is characterized in that, described head pressure computing unit calculates the pressure of described discharge pressure region based on external information, and described external information is detected by the pressure sensing cell that detects from the discharge pressure region of described variable displacement compressor to the pressure of the high-pressure area of the expander of refrigeration cycle.
According to the tenth invention, a kind of capacity control system of variable displacement compressor is provided, it is characterized in that, comprise temperature automatic expansion valve as described expander, and comprise the degree of superheat computing unit based on the degree of superheat of the exit region that is calculated described vaporizer by the detected external information of described pressure sensing cell, described suction pressure is inferred described suction pressure zone is inferred in the unit based on the external information of being calculated by described degree of superheat computing unit pressure.
According to the 11 invention, a kind of capacity control system of variable displacement compressor is provided, it is characterized in that, comprise the degree of superheat detection unit of the described external information detection unit of conduct of the degree of superheat that detects the suction pressure zone of described variable displacement compressor from the exit region of described vaporizer, described suction pressure is inferred the unit based on the pressure of being inferred described suction pressure zone by the detected external information of described degree of superheat detection unit.
According to the 12 invention, a kind of capacity control system of variable displacement compressor is provided, it is characterized in that, by described target suction pressure setup unit preset threshold, upper limit threshold or lower threshold and become the pressure difference of described target suction pressure of the benchmark of threshold value, upper limit threshold or lower threshold, change based on this target suction pressure.
According to the 13 invention, a kind of capacity control system of variable displacement compressor is provided, it is characterized in that, the driving load calculation unit that comprises the driving load of calculating described variable displacement compressor, be judged to be described variable displacement compressor when moving with maximum discharge capacity at described discharge capacity identifying unit, described driving load calculation unit drives the driving load that the load calculation formula is calculated described variable displacement compressor with first; When described discharge capacity identifying unit was judged to be described variable displacement compressor with the action of controlled discharge capacity, described driving load calculation unit drove the driving load that the load calculation formula is calculated described variable displacement compressor with second.
According to the 14 invention, a kind of capacity control system of variable displacement compressor is provided, it is characterized in that the first driving load calculation formula of described driving load calculation unit comprises by the pressure of the described discharge pressure region of described head pressure computing unit calculating, infers the pressure in the described suction pressure zone of inferring the unit as variable by described suction pressure.
According to the 15 invention, a kind of capacity control system of variable displacement compressor is provided, it is characterized in that the described target suction pressure that second of described driving load calculation unit drives pressure that the load calculation formula comprises the described discharge pressure region of being calculated by described head pressure computing unit, set by described target suction pressure setup unit is as variable.
According to the 16 invention, a kind of capacity control system of variable displacement compressor is provided, it is characterized in that second of described driving load calculation unit drives the pressure difference of load calculation formula pressure that comprises the described discharge pressure region of being calculated by described head pressure computing unit and the described target suction pressure of being set by described target suction pressure setup unit as variable.
According to the 17 invention, a kind of capacity control system of variable displacement compressor is provided, described variable displacement compressor is for constituting the refrigeration cycle and the radiator of air-conditioning system, expander and vaporizer press from both sides the circulation road that inserts in for refrigerant cycle together, capacity is based on the variation of pilot pressure and change, comprise: capacity control drive, described capacity control drive is a head pressure with the pressure of the described refrigeration agent of the random position of the discharge pressure region of described refrigeration cycle, and when being suction pressure with the pressure of the described refrigeration agent of the random position in the suction pressure zone of described refrigeration cycle, have and be subjected to described head pressure and be subjected to described suction pressure and solenoidal electromagnetic force in the direction relative with described head pressure, can make valve opening open the spool of closing, can be by described valve opening being opened close and being made described pilot pressure change the capacity of adjusting described variable displacement compressor; External information detection unit, described external information detection unit are used to detect the external information 1 or more relevant with described refrigeration cycle; And target suction pressure setup unit, described target suction pressure setup unit is based on by the detected external information of described external information detection unit, the pressure in described suction pressure zone is come the target setting suction pressure as controlling object, based on the aperture of adjusting described capacity control drive by the detected external information of described external information detection unit, described pilot pressure is changed, adjust in view of the above from the discharge capacity of the refrigeration agent of described variable displacement compressor discharge, the capacity control system of described variable displacement compressor is characterised in that, comprise: the head pressure computing unit, described head pressure computing unit is based on the pressure that is calculated the discharge pressure region of described variable displacement compressor by the detected external information of described external information detection unit; The control signal computing unit, described control signal computing unit calculates the discharge capacity control signal based on the pressure of the described discharge pressure region that is calculated by described head pressure computing unit and by the target suction pressure that described target suction pressure setup unit configures; The solenoid-activated unit, described solenoid-activated unit provides electric current based on the discharge capacity control signal that is calculated by described control signal computing unit to the solenoid of described capacity control drive; Discharge capacity identifying unit, described discharge capacity identifying unit is judged the discharge capacity of described variable displacement compressor; And driving load calculation unit, the driving load that described driving load calculation unit calculates described variable displacement compressor.
According to the 18 invention, a kind of capacity control system of variable displacement compressor is provided, it is characterized in that, described driving load calculation unit, be judged to be described variable displacement compressor when moving at described discharge capacity identifying unit, drive the driving load that the load calculation formula is calculated described variable displacement compressor with first with maximum discharge capacity; When described discharge capacity identifying unit is judged to be described variable displacement compressor with the action of controlled discharge capacity, drive the driving load that the load calculation formula is calculated described variable displacement compressor with second.
According to the 19 invention, a kind of capacity control system of variable displacement compressor is provided, it is characterized in that described driving load calculation unit will export the vehicle side engine controlling unit to by the driving load of the described variable displacement compressor that calculates.
According to the 20 invention, a kind of capacity control system of variable displacement compressor is provided, it is characterized in that described variable displacement compressor comprises: shell, described shell are formed with in internal separation discharges chamber, crank chamber, suction chamber and cylinder thorax; Piston, described piston are provided in described cylinder thorax; Live axle, described live axle rotatably are supported in the described shell; It is the variable swash plate member in reciprocating angle of inclination of described piston that shifting mechanism, described shifting mechanism comprise the rotation transformation of described live axle; The air feed path, described air feed path is communicated with described discharge chamber and described crank chamber; And the path of bleeding, the described path of bleeding is communicated with described suction chamber and described crank chamber, and described capacity control drive folder inserts in the side in described air feed path and the described path of bleeding.
According to the 21 invention, a kind of display unit is provided, the capacity control system that is used for variable displacement compressor, described display unit is characterised in that, when described discharge capacity identifying unit is judged to be described variable displacement compressor with the action of controlled discharge capacity, can be used as visual information identification ground and show the dynamically working state of economizing.
According to the 22 invention, a kind of display unit is provided, the refrigeration cycle that is used for air-conditioning system, described refrigeration cycle is by disposing radiator, expander and vaporizer in the circulation road of refrigerant cycle, and configuration capacity based on the variation of pilot pressure and the variable displacement compressor that changes form, described display unit is characterised in that, the capacity control system that is used for variable displacement compressor, described capacity control system comprises: can be by described pilot pressure being changed adjust the capacity control drive of the capacity of described variable displacement compressor; Be used to detect the external information detection unit of the external information 1 or more relevant with described refrigeration cycle; Based on by the detected external information of described external information detection unit, the pressure in described suction pressure zone is come the target suction pressure setup unit of target setting suction pressure as controlling object; And the driving load calculation unit that calculates the driving load of described variable displacement compressor, will can be used as visual information identification ground from the driving load signal of described driving load calculation unit and show.
According to the 23 invention, a kind of display unit is provided, it is characterized in that the capacity control system of described variable displacement compressor comprises the discharge capacity identifying unit of the discharge capacity of judging variable displacement compressor.
According to the 24 invention, a kind of display unit is provided, it is characterized in that described discharge capacity identifying unit judges it is the state of described variable displacement compressor with the action of maximum discharge capacity, or described variable displacement compressor is with the state of controlled discharge capacity action.
According to the 25 invention, a kind of display unit is provided, it is characterized in that, when described discharge capacity identifying unit is judged to be described variable displacement compressor with the action of controlled discharge capacity, can be used as visual information identification ground and show the energy conservation state.
According to the capacity control system of first invention and second variable displacement compressor of inventing, can judge that variable displacement compressor is to discharge the capacity status running with maximum, still turns round to discharge the volume controlled state.This information for example can be applied flexibly in the control of the stabilization of speed of the motor that makes vehicle etc., can be energy-conservation making contributions to a ring of global warming countermeasure.
In the capacity control system of the 3rd variable displacement compressor of inventing, it is the threshold value of benchmark that target suction pressure setup unit is set with the target suction pressure.In view of the above, can set the zone that to judge the operating condition of variable displacement compressor reliably.
In the capacity control system of the 4th variable displacement compressor of inventing, it is the upper limit threshold and the lower threshold of benchmark that target suction pressure setup unit is set with the target suction pressure.In view of the above, can set and to judge reliably that variable displacement compressor is to discharge the capacity status running or to discharge the zone of volume controlled state running with maximum.
In the capacity control system of the 5th～the 7th variable displacement compressor of inventing, even can't judge reliably that variable displacement compressor is to discharge the capacity status running or to discharge the zone of volume controlled state running, also can realize judging the raising of precision with maximum.
In the capacity control system of the 8th～the 12 variable displacement compressor of inventing, can judge more reliably that variable displacement compressor is with maximum discharge capacity status running or to discharge the running of volume controlled state.
In the capacity control system of the 13～the 16 variable displacement compressor of inventing, can improve with the calculation accuracy of suction pressure as the driving load of the variable displacement compressor of controlling object.
According to the capacity control system of the 17 and the 18 variable displacement compressor of inventing, can carry out suction pressure control with simpler structure, can also improve the calculation accuracy of the driving load of variable displacement compressor in addition.
In the capacity control system of the 19 variable displacement compressor of inventing, the driving load signal of the variable displacement compressor that calculation accuracy improves inputs to the vehicle side engine controlling unit.As a result, the capacity control system of this variable displacement compressor is made bigger contribution to the stabilization of engine control.
In the capacity control system of the 20 variable displacement compressor of inventing, variable displacement compressor is a reciprocating motion type.Stroke by the piston of this variable displacement compressor of the minimum cant of swash plate member regulation can be set very for a short time, and it is very little to make the minimum of variable displacement compressor discharge capacity.Therefore, can widen the variable range of machinery of the discharge capacity of variable displacement compressor.As its result,, can give full play to the effect that enlarges the control range of suction pressure by the target setting suction pressure according to this capacity control system.
According to the display unit of the 21～the 25 invention, when using air-conditioning, promote the energy-conservation of variable displacement compressor, and can improve the environmental consciousness of user air-conditioning system.
Description of drawings
The present invention can fully understand according to following detailed description and accompanying drawing, but accompanying drawing be an example and and non-limiting the present invention.
Fig. 1 is the explanatory drawing of schematic configuration of representing the refrigeration cycle of the automotive air conditioning system that a mode of execution is related with the longitudinal section of variable displacement compressor.
Fig. 2 is the cross-sectional illustration figure of coupled condition of capacity control drive of the variable displacement compressor of presentation graphs 1.
Fig. 3 is the chart of the relation of the control electric current of capacity control drive of presentation graphs 1 and target suction pressure.
Fig. 4 is the cross-sectional illustration figure that is illustrated in the temperature automatic expansion valve that uses in the refrigeration cycle of the variable displacement compressor that comprises Fig. 1.
Fig. 5 is the chart of degree of superheat characteristic of the temperature automatic expansion valve of presentation graphs 4.
Fig. 6 is the block diagram of schematic configuration of the capacity control system of expression one mode of execution.
Fig. 7 is the chart of the expression degree of superheat with respect to the variation characteristic of the inlet pressure of the temperature automatic expansion valve of Fig. 4.
Fig. 8 is the block diagram that is illustrated in the external information of using in the driving load calculation of capacity control system of a mode of execution.
Fig. 9 is the explanatory drawing of schematic configuration of representing the refrigeration cycle of the automotive air conditioning system that other mode of executions are related with the longitudinal section of variable displacement compressor.
Figure 10 is the cross-sectional illustration figure of coupled condition of capacity control drive of the variable displacement compressor of presentation graphs 9.
Figure 11 is the chart of the relation of the control electric current of capacity control drive of presentation graphs 9 and target suction pressure.
Figure 12 is the block diagram of schematic configuration of the capacity control system of other mode of executions of expression.
Figure 13 is the flow chart of the suction pressure control program carried out of the capacity control system of expression Figure 12.
Figure 14 is the flow chart of the target suction pressure setting program that comprised of the suction pressure control program of Figure 13.
Label declaration
100: variable displacement compressor
101: shell
101a: cylinder thorax
105: crank chamber
106: live axle
130: piston
140: suction chamber
142: discharge the chamber
200,300: capacity control drive
202,301a: valve opening
204,304: spool
215,315: solenoid unit (solenoid)
350,400: control gear
351,420: target suction pressure setup unit
352: the control signal computing unit
401: vaporizer target temperature setup unit (external information detection unit)
402: temperature transducer (evaporator temperature detection unit; The external information detection unit)
403: pressure transducer (head pressure detection unit; The external information detection unit)
404: extraneous gas temperature transducer (external information detection unit)
405: vehicle interior temperature sensor (external information detection unit)
406: evaporator fan voltage detection unit (external information detection unit)
408: engine rotation speed sensor (compressor rotary speed detection unit; The external information detection unit)
410: the control current calculation unit
411: the solenoid-activated unit
421: the head pressure computing unit
422: degree of superheat computing unit
423: suction pressure is inferred the unit
424: discharge the capacity identifying unit
425: drive the load calculation unit
460: display unit
Embodiment
Below, based on the capacity control system of accompanying drawing detailed description variable displacement compressor involved in the present invention.
Fig. 1～Fig. 8 represents a mode of execution of the capacity control system of variable displacement compressor involved in the present invention.In the present embodiment, expression is used for the capacity control system A of variable displacement compressor involved in the present invention the situation of the refrigeration cycle of automotive air conditioning system.
As shown in Figure 1, the refrigeration cycle 10 of automotive air conditioning system comprises the circulation road 12 as the refrigerant cycle of working fluid.On this circulation road 12, dispose variable displacement compressor 100, radiator (condenser) 14, expander (temperature automatic expansion valve) 16 and vaporizer 18 successively along the flow direction of refrigeration agent.If variable displacement compressor 100 work is also carried out the operation of the refrigeration agent that is sucked by the operation that sucks refrigeration agent, compression and is discharged a series of processing that the operation of refrigerant compressed constitutes, then refrigeration agent 12 circulations on the circulation road.
Vaporizer 18 also constitutes the part of the air loop of automotive air conditioning system, and the air-flow by vaporizer 18 is seized vaporization heat by the refrigeration agents in the vaporizer 18, thereby is cooled.
Variable displacement compressor 100 for example is the clutchless compressor of ramp type, comprises the cylinder body 101 with a plurality of cylinder thorax 101a.Linking at an end of this cylinder body 101 has fore shell 102, and linking by valve plate 103 at the other end of cylinder body 101 has back cover (cylinder cap) 104.
Inside by cylinder body 101 and fore shell 102 encirclements forms as crank chamber 105, and live axle 106 passes through this crank chamber 105 and disposes interiorly.Live axle 106 runs through the swash plate 107 that is configured in the ring-type in the crank chamber 105 equally.Swash plate 107 combines with the rotor 108 usefulness hinges that are fixed in live axle 106 by linking department 109.Therefore, swash plate 107 can carry out banking motion when live axle 106 moves.
Be equipped with the helical spring 110 of swash plate 107 at the part place between rotor 108 and swash plate 107 of live axle 106 to the minimum cant effect.On the other hand, in the part of the opposition side that clips swash plate 107, be that the part place between swash plate 107 and cylinder body 101 of live axle 106 is equipped with the helical spring 111 of swash plate 107 to the effect of maximum inclination angle.
The end of fore shell 102 sides of live axle 106 is through the lug boss 102a that forms toward the outer side at fore shell 102, and is outstanding to the outside.End at this live axle 106 links the belt pulley 112 that has as power transmitting deice.Belt pulley 112 by ball bearing 113 by lug boss 102a free rotary ground supporting, at belt pulley 112 and between as the motor 114 of external drive source around being laid with belt 115.
The inboard of lug boss 102a disposes gland seal device 116, and gland seal device 116 cuts off the inside of fore shell 102 with outside.Live axle 106 is radially reaching on the thrust direction by bearing 117,118,119,120 free rotary ground supportings.When being passed to belt pulley 112 from the power of motor 114, live axle 106 can be rotated synchronously with the rotation of belt pulley 112.
Dispose piston 130 in the cylinder thorax 101a, be formed with on the piston 130 towards crank chamber 105 interior outstanding afterbodys.Dispose a pair of crawler shoe 132 at the recess 130a that is formed at afterbody, these crawler shoe 132 relative swash plate 107 peripheral parts state sliding contacts to clamp.Therefore, by crawler shoe 132, mutual interlock between piston 130 and the swash plate 107, by the rotation of live axle 106, piston 130 to-and-fro motion in cylinder thorax 101a.
Be formed with suction chamber 140 and discharge chamber 142 in back cover 104 divisions.Suction chamber 140 can be communicated with cylinder thorax 101a by the inlet hole 103a that is located at valve plate 103.Discharging chamber 142 can be communicated with cylinder thorax 101a by the tap hole 103b that is located at valve plate 103.Inlet hole 103a and tap hole 103b are opened, close by not shown suction valve and expulsion valve respectively.
Sidepiece at cylinder body 101 is provided with baffler (muffler) 150.Muffler shell 152 engages with the baffler base 101b that is integrally formed at cylinder body 101 by not shown sealing component.Muffler shell 152 and baffler base 101b form silencer space 154.Silencer space 154 is communicated with discharge chamber 142 by the drain passageway 156 that runs through back cover 104, valve plate 103 and baffler base 101b.
Muffler shell 152 is formed with discharges port 152a, and in silencer space 154, safety check 180 is configured to drain passageway 156 and discharges between the port 152a and cut off.
Specifically, safety check 180 opens, cuts out according to the pressure difference between the pressure of the pressure of drain passageway 156 sides and silencer space 154 sides.Safety check 180 hour carries out closing motion than specified value when pressure difference, and carries out opening action when pressure difference is bigger than specified value.
Therefore, discharge chamber 142 and can pass through drain passageway 156, silencer space 154 and discharge port 152a to be communicated with the past road part on circulation road 12, silencer space 154 is cut off, is communicated with by safety check 180.On the other hand, suction chamber 140 is communicated with the loop feature on circulation road 12 by the inhalation port 104a that is formed at back cover 104.
The capacity control drive of this variable displacement compressor 100 (solenoid electric valve) 200 is housed in back cover 104.Capacity control drive 200 is configured in air feed path 160.Air feed path 160 extends to cylinder body 101 via valve plate 103 and forms from back cover 104, discharges between chamber 142 and the crank chamber 105 to be communicated with.
On the other hand, suction chamber 140 is communicated with crank chamber 105 by the path 162 of bleeding.The path 162 of bleeding is made of gap, space 164 between live axle 106 and the bearing 119,120 and the fixed orifice 103c that is formed at valve plate 103.
In addition, suction chamber 140 is independent of air feed path 160 ground and is connected in capacity control drive 200 via the pressure-sensitive path 166 that is formed at back cover 104.
In more detail, as shown in Figure 2, capacity control drive 200 has valve cell and makes valve cell open the driver element of closing motion.Valve cell has valve casing 201 cylindraceous, and side is formed with valve opening 202 in the diagram underpart of this valve casing 201.This valve opening 202 is communicated with crank chamber 105 by the downstream side part of outlet port 201b and air feed path 160, and towards valve chamber 203 openings that are formed at the diagram underpart of valve casing 201.
Contain cylindric spool 204 in the valve chamber 203.This spool 204 can move by the axial direction along valve casing 201 in valve chamber 203, by with valve casing 201 end face butts just can inaccessible valve opening 202.That is, the end face of valve casing 201 plays the effect of valve seat.
In addition, the outer circumferential face at valve casing 201 is formed with ingress port 201a.This ingress port 201a is communicated with discharge chamber 142 by the upstream side part of air feed path 160.This ingress port 201a, discharges chamber 142 and can be communicated with crank chamber 105 via valve chamber 203, valve opening 202 and outlet port 201b also towards valve chamber 203 openings.
And side disposes pressure-sensitive chamber 206 in the diagram upper end portion of valve casing 201, and this pressure-sensitive chamber 206 is communicated with suction chamber 140 by pressure-sensitive port 207 and pressure-sensitive path 166.
Spool 204 has at pressure-sensitive bar 204a spool main body one and coaxial formation, that give prominence in pressure-sensitive chamber 206.This pressure-sensitive bar 204a is supported slidably by valve casing 201.
Pressure-sensitive chamber 206 is to form by the recess 201d that is formed at valve casing 201 with cap 208 obturations.Contain bellows 212 in pressure-sensitive chamber 206, the inner sustain of bellows 212 is a vacuum.In addition, the internal configurations at bellows 212 has spring 210.Bellows 212 works as the pressure-sensitive parts that are subjected to the pressure of suction chamber 140.
The pressure-sensitive bar 204a butt of the diagram underpart of bellows 212 and spool 204.The diagram upper end portion of bellows 212 is directed part 211 supportings, and guide 211 is supported slidably by cap 208.Between cap 208 and guide 211, dispose and force open spring 213, force open spring 213 that bellows 212 is pushed to valve opening position all the time.Adjust the be pressed into amount of cap 208, make capacity control drive 200 carry out compulsory exercise to the recess 201d of valve casing 201.
On the other hand, driver element is the solenoid unit 215 that is attached at the diagram lower end side of valve casing 201.Driver element comprises: with the solenoid cover cylindraceous 221 of valve casing 201 coaxial bindings, with end caps 222 solenoid cover 221 and opening end obturations valve casing 201 opposition sides.
On the axle center of solenoid cover 221, dispose sleeve 223.Sleeve 223 constitutes the cylindric of the end, has opening end in valve casing 201 sides.Contain fixed iron core 224 in part from the opening end of sleeve 223 to central authorities.Form containing space 225 unshakable in one's determination between the dead end of the sleeve 223 of end cap 222 sides and fixed iron core 224, unshakable in one's determination 226 can be housed in containing space 225 unshakable in one's determination vertically movably.Between fixed iron core 224 and movable core 226, be provided with specified gap.
Inserting hole 224a in the axle center that is positioned at fixed iron core 224 disposes solenoid rod 227.The end of the solenoid rod 227 of valve chamber 203 sides and spool 204 one link.The other end of solenoid rod 227 is given prominence to the chimeric penetration hole that is formed at movable core 226 that is fixed on to containing space 225 unshakable in one's determination.In view of the above, movable core 226 moves integratedly with solenoid rod 227.Between the dead end of movable core 226 and sleeve 223, dispose all the time movable core 226 and solenoid rod 227 to closing the spring 230 that the valve direction is pushed.
Dispose the coil 229 that is wound in bobbin 228 around the sleeve 223 in solenoid cover 221.Bobbin 228 and coil 229 utilize moulding to be covered by resin.Solenoid cover 221, end cap 222, fixed iron core 224 and movable core 226 are all formed by magnetic material, constitute magnetic circuit.Sleeve 223 is formed by the stainless steel-like material of nonmagnetic substance.
Containing space 225 unshakable in one's determination is communicated with the pressure-sensitive chamber 206 of valve casing 201 by the intercommunicating pore 201c that is formed at valve casing 201.That is, containing space 225 unshakable in one's determination is communicated with suction chamber 140 by pressure-sensitive chamber 206 and intercommunicating pore 201c.Therefore, in the diagram upper-end surface of spool 204, the pressure of crank chamber 105 is as the power effect of valve opening position; On the other hand, in the diagram lower end surface of spool 204, the suction pressure of suction chamber 140 is as the power effect of closing the valve direction.
In addition, in capacity control drive 200, can set the area of valve opening 202, the sectional area of spool 204 that is formed on the bearing hole 224b supporting of fixed iron core 224 identical.This moment, the head pressure of opening closing motion and being communicated in the valve chamber 203 of discharging chamber 142 of spool 204 was uncorrelated.That is, the suction pressure control characteristic of this capacity control drive 200 is not subjected to the influence of head pressure.Therefore, as shown in Figure 3, can be based on the suction pressure that the energising amount of solenoid unit 215 is determined to become uniquely controlling object.
Be connected with the control gear 400 that is arranged at variable displacement compressor 100 outsides at solenoid unit 215.Solenoid unit 215 then produces electromagnetic force F (I) if provide the control electric current I from control gear 400.The electromagnetic force F of this solenoid unit 215 (I) attracts movable core 226 towards fixed iron core 224, make spool 204 close valve work.
In the refrigeration cycle 10 of automotive air conditioning system, under engine behavior, do not make air regulator when work, the solenoid unit 215 to the capacity control drive 200 of variable displacement compressor 100 does not provide electric current.At this moment, spool 204 is forced to leave from valve opening 202 owing to the elastic force of spring 213, and capacity control drive 200 becomes out the valve state.Therefore, variable displacement compressor 100 discharge capacity become minimum.
At this moment, owing to the power of giving closing direction all the time, therefore cut off and provide refrigeration agent to the past road on circulation road 12 part from compressor 100 to safety check 180.Consequently, the refrigeration agent of discharging to discharge chamber 142 with the discharge capacity of minimum is inserted with the air feed path 160 of capacity control drive 200 and flows into crank chamber 105 through folder, and next, path 162 returns suction chamber 140 from crank chamber 105 by bleeding.That is, when not making air regulator work, a spot of refrigeration agent is in the inner loop of compressor 100.
On the other hand, when making air regulator work, provide electric current to solenoid unit 215.In view of the above, spool 204 overcome spring 213 elastic force and with valve opening 202 butts, capacity control drive 200 becomes the valve state that closes.This means and cut off air feed path 160.As its result, the pressure in the crank chamber 105 descends, and is identical with suction pressure.
In view of the above, because the angle of inclination of swash plate 107 increases, the stroke of piston 130 increases, and the pressure of therefore discharging chamber 142 improves.If the front and back differential pressure of safety check 180 surpasses specified value, then valve left by safety check 180, and refrigerant compressed provides the past road part to circulation road 12.
And in the work of such variable displacement compressor 100, the solenoid unit 215 of 400 pairs of capacity control drives 200 of control gear provides the control electric current I, produces electromagnetic force F (I).This be for the discharge capacity of controlling variable displacement compressor 100 to keep the suction pressure of regulation shown in Figure 3.
Fig. 4 represents the temperature automatic expansion valve 16 as expander.The aperture of expansion valve 16 is mechanically carried out feedback control, makes the degree of superheat of exit region of vaporizer 18 become specified value.The control characteristic of expansion valve 16 for example is a degree of superheat characteristic shown in Figure 5.
The temperature and the relation (degree of superheat characteristic) of pressure P e of the pressure P in of refrigeration agent that the straight line C1 of Fig. 5 is illustrated in expander 16 inlet refrigeration agent of vaporizer 18 outlets during for the certain value of regulation are that the structure by expander 16 determines.The saturation temperature of curve C 2 expression refrigeration agents (R134a) and the relation of saturation pressure, expansion valve 16 have the structure that straight line C1 and curve C 2 are intersected.Among Fig. 5, the straight line C1 on X direction is corresponding with the degree of superheat SH of the refrigeration agent of vaporizer 18 outlets with the difference of curve C 2.
Fig. 6 is the block diagram of schematic configuration that expression comprises the capacity control system A of control gear 400.
Capacity control system A has the external information detection unit that detects 1 above external information.The external information detection unit comprises vaporizer target temperature setup unit 401 and as the temperature transducer 402 of evaporator temperature detection unit.
Vaporizer target temperature setup unit 401 is based on comprising the various external informations that temperature is set in the compartment, set vaporizer target outlet air temperature Tes, and, the vaporizer target outlet air temperature Tes that sets is inputed to control gear 400 as 1 external information.Vaporizer target outlet air temperature Tes is the desired value at the air temperature Te of the outlet of vaporizer 18 of target that becomes the discharge volume controlled of compressor 100.Vaporizer target temperature setup unit 401 can use the part of ECU to constitute with the air regulator of the action of for example controlling air-conditioning system integral body.
Temperature transducer 402 is arranged at the outlet port of vaporizer 18 in the air loop, detects firm temperature T e (with reference to Fig. 1) by the air behind the vaporizer 18.Detected air temperature Te inputs to control gear 400 as 1 external information.
In addition, the external information detection unit comprises the head pressure computing unit, and the head pressure computing unit has its a part of pressure transducer 403 of formation.The head pressure computing unit is the unit that is used for the head pressure Pd of detection effect on spool 204.Pressure transducer 403 is installed in the inlet side of radiator 14, detects the pressure of the refrigeration agent at this position, inputs to control gear 400 (with reference to Fig. 1).
And the external information detection unit comprises extraneous gas temperature transducer 404 and vehicle interior temperature sensor 405.Extraneous gas temperature transducer 404 is arranged on the air input part that is used for the extraneous gas of outside vehicle is sucked the vehicle of air loop, detects extraneous gas temperature T a.Vehicle interior temperature sensor 405 is arranged in the compartment, detects temperature T t in the compartment.
And the external information detection unit comprises evaporator fan voltage detection unit 406 and inside and outside gas switches door position detection unit 407.Evaporator fan voltage detection unit 406 detects voltage Vf index, that fan motor is applied of the ventilation state that becomes evaporator fan.Inside and outside gas switches the state As that door position detection unit 407 detects ventilating path, and promptly detecting is extraneous gas importing pattern or internal gas circulation mode.
And the external information detection unit comprises the compressor rotary speed detection unit of the rotational speed N c that is used to detect compressor 100.The compressor rotary speed detection unit has the engine rotation speed sensor 408 of the rotating speed of detection of engine 114, by multiply by the belt pulley ratio of regulation, can detect the rotational speed N c of compressor 100 by the rotating speed of engine rotation speed sensor 408 detected motors 114.
Structure to the compressor rotary speed detection unit is not particularly limited, as long as can detect the rotating speed of compressor 100 based on the physical quantity relevant with the rotating speed of compressor 100.In addition, the physical quantity relevant with the rotating speed of compressor 100 also comprises the rotating speed of compressor 100 itself.
In addition, the discharge pressure region of refrigeration cycle 10 is meant from discharging the zone of chamber 142 to the inlet of radiator 14; The suction pressure zone of refrigeration cycle 10 is meant the zone that exports to suction chamber 140 from vaporizer 18.In addition, discharge pressure region also comprises the cylinder thorax 101a in the compression section, and the suction pressure zone also comprises the cylinder thorax 101a in the inhalation process.
Herein, control gear 400 for example is made of ECU (electronic control unit) independently, but can also include the motor ECU of air regulator with the action of ECU or control motor 114.In addition, also vaporizer target temperature setup unit 401 can be included in control gear 400.
In addition, control gear 400 has control current calculation unit 410 and volume controlled portion is discharged in 411 conducts of solenoid-activated unit.
Control current calculation unit 410 calculate the vaporizer target outlet air temperature Tes that configures by vaporizer target temperature setup unit 401, with deviation by the evaporator air outlet temperature Te of evaporator temperature sensor 402 detected reality, for example utilize PI control (perhaps PID control) compute control electric current I, so that this deviation is dwindled.
In addition, solenoid-activated unit 411 provides the control electric current I based on the energising amount that is calculated by control current calculation unit 410 to solenoid unit 215, drives capacity control drive 200.The control electric current I can (for example 400～500Hz) PWM (pulsewidth modulation) change duty be recently adjusted by the regulation driver frequency.And solenoid-activated unit 411 detects the control electric current I that flows through solenoid unit 215, and the control electric current I is carried out feedback control, makes above-mentioned detected control electric current I become the energising amount that is calculated by control current calculation unit 410.
Like this, the discharge volume controlled portion control discharge capacity of control gear 400, feasible evaporator air outlet temperature Te by evaporator temperature sensor 402 detected reality is near the vaporizer target outlet air temperature Tes that is configured by vaporizer target temperature setup unit 401.
And control gear 400 has: target suction pressure setup unit 420, head pressure computing unit 421, degree of superheat computing unit 422, suction pressure are inferred unit 423, discharge capacity identifying unit 424 and are driven load calculation unit 425.
The control electric current I that target suction pressure setup unit 420 bases are calculated by control current calculation unit 410, based on characteristic shown in Figure 3, setting threshold (upper limit threshold PssH and lower threshold PssL).The suction pressure control characteristic of capacity control drive 200 is because device size tolerance when producing etc. and can have deviation.Consider this deviation, threshold value can be set the target suction pressure Pss with the corresponding decision of control electric current I as benchmark.In addition, upper limit threshold PssH and lower threshold PssL and scope as the target suction pressure Pss of benchmark change based on the control electric current I.
Head pressure computing unit 421 calculates the pressure P d in the discharge nip territory of variable displacement compressor 100 based on by pressure transducer 403 detected pressure P h.Pressure transducer 403 that the position is set is different with the position, discharge nip territory of variable displacement compressor 100, in the bigger operation range of thermal load, between pressure P h and pressure P d, have pressure difference sometimes.Consider this pressure difference, come calculating pressure Pd according to pressure P h.That is, the pressure P d in the discharge nip territory of variable displacement compressor 100 can utilize and will be calculated as the function f 1 (Ph) of variable by pressure transducer 403 detected pressure P h, and this function f 1 (Ph) can be obtained in advance.
Degree of superheat computing unit 422 calculates the degree of superheat SH at the refrigeration agent of the exit region of vaporizer 18.Specifically, based on calculating degree of superheat SH by pressure transducer 403 detected pressure P h.Degree of superheat SH also can utilize and will be calculated as the function f 2 (Ph) of variable by pressure transducer 403 detected pressure P h.This is because the cause that temperature automatic expansion valve 16 shown in Figure 4 moves with the relation of formula (1)～(3).According to formula (2), if the inlet pressure Pin of temperature automatic expansion valve 16, be that the pressure P h of high-pressure area changes, then the spool 501 of relative expansion valve 16 changes to the power Fb of closing direction effect.Formula (3) is the valve condition of opening of expansion valve 16, drives valve or closes valve if power Fb changes then expansion valve 16, and as shown in Figure 7, degree of superheat SH changes.
Fd＝(Pn-Pe)·Sd-(Pout-Pe)·Sr-F1···(1)
Fb＝F2+(Pin-Pout)·Sb···(2)
Fd＞Fb···(3)
Wherein, Fd is the power to the valve opening position effect of spool 501, Fb is the power of closing the valve directive effect to spool 501, and Pn is the internal pressure of temperature-sensitive portion 505, and Pe is the outlet pressure of vaporizer 18, Pin is the inlet pressure of temperature automatic expansion valve 16, Pout is the outlet pressure of temperature automatic expansion valve 16, and F1, F2 are respectively the pressing forces of spring 508,503, and Sd is the useful area of barrier film 506, Sb is the sealing area of spool 501, and Sr is the sectional area that transmits bar 507.
Suction pressure is inferred unit 423 utilizations will be by the pressure P d of head pressure computing unit 421 calculating, degree of superheat SH by 422 calculating of degree of superheat computing unit, extraneous gas temperature T a by 404 detections of extraneous gas temperature transducer, by temperature T t in the compartment of vehicle interior temperature sensor 405 detections, voltage Vf by 406 detections of evaporator fan voltage detection unit, switch the state As of the ventilating path of door position detection unit 407 detections by inside and outside gas, the compressor rotary speed Nc that is detected by engine rotation speed sensor 408 is as the function f 3 (Pd of variable, SH, Ta, Tt, Vf, As, Nc), by calculation suction pressure Ps.At this moment because Pd=f1 (Ph) and SH=f2 (Ph), so suction pressure Ps can utilize with Pd, Ta, Tt, Vf, As, Nc as the function f 4 of variable (Ph, Ta, Tt, Vf, As Nc) calculates.
In addition, also can use the degree of superheat detection unit of degree of superheat SH of refrigeration agent that directly detects the suction pressure zone of variable displacement compressor 100 from the exit region of vaporizer 18, to replace degree of superheat computing unit 422.
Next, the consideration method of inferring of the suction pressure Ps that utilizes suction pressure to infer to carry out unit 423 is described.
Under the state of variable displacement compressor 100 with the running of maximum discharge capacity, if can know the pressure P d of discharge pressure region, the thermal load Q of vaporizer 18, the Subcoold temperature of expansion valve 16 inlets, degree of superheat SH and the rotational speed N c of variable displacement compressor 100 and the volumetric efficiency η of variable displacement compressor 100 of vaporizer 18 outlets, then can roughly accurately infer the pressure P s in the suction pressure zone of variable displacement compressor 100.
Herein, the thermal load Q of vaporizer 18 is an extraneous gas when importing pattern at the state As of ventilating path, can be according to (Ta Vf) calculates as the function f 4 of variable with Ta, Vf; On the other hand, when the state As of ventilating path is the internal gas circulation mode, can be according to (Tt Vf) calculates as the function f 5 of variable with Tt, Vf.
In addition, the Subcoold temperature SC of expansion valve 16 inlets can significantly not change in the refrigeration cycle 10 of serviceability temperature automatic expansion valve 16.Therefore, for example also Subcoold temperature SC decision can be certain fixed value.This value can be by corrections such as other known variables Pd, Ta, Vf, As.
And the volumetric efficiency η of variable displacement compressor 100 can be based on other known variables, and for example (Q Nc) calculates the function f 6 of Pd, Q, Nc, SH for Pd, SH.Function f 6 can generate mapping according to various operating conditions in advance, determines based on mapping.
Like this, use existing sensor, under the state of variable displacement compressor 100, can roughly accurately infer the pressure in suction pressure zone with the running of maximum discharge capacity.In addition, the humidity as if knowing in extraneous gas and the compartment then can improve the precision of inferring of thermal load.Therefore, also can use in extraneous gas humidity transducer and the compartment humidity transducer as the thermal load detection unit respectively.
In addition, externally under the gas importing pattern, also can be according to (Ta, Vf Vs) calculate the thermal load Q of vaporizer 18 as the function f 7 of variable with Ta, Vf, Vs.Vs is the speed of a motor vehicle.This is because under vehicle velocity V s is situation more than the specified value, and vehicle velocity V s bring influence can for the air output of vaporizer 18.
The upper limit threshold PssH that 424 pairs of discharge capacity identifying units are configured by target suction pressure setup unit 420, the pressure P s that infers the suction pressure zone that unit 423 configures by suction pressure compare.If Ps＞PssH then discharges capacity identifying unit 424 and judges that variable displacement compressor 100 is in the state with the running of maximum discharge capacity.
On the other hand, the pressure P s that discharge lower threshold PssL that 424 pairs of capacity identifying units configure by target suction pressure setup unit 420, infers the suction pressure zone that unit 423 configures by suction pressure compares.If Ps＜PssL, then discharge capacity identifying unit 424 and be judged to be variable displacement compressor 100 and be in state with controlled discharge capacity running, in other words, be in state with the discharge capacity running of discharging capacity less than maximum.
When PssL≤Ps≤PssH, discharge 424 couples of decision content PsV of capacity identifying unit and target suction pressure Pss and compare.Decision content PsV can be set in arbitrarily between upper limit threshold PssH and the lower threshold PssL.If Pss 〉=PsV, then discharge capacity identifying unit 424 and be judged to be variable displacement compressor 100 and be in state with the running of maximum discharge capacity.If Pss＜PsV, then discharge capacity identifying unit 424 and be judged to be variable displacement compressor 100 and be in state with controlled discharge capacity running.
In addition, decision content PsV also can be based on vehicle velocity V s or compressor rotary speed Nc and is changed.For example, can in low-speed region, set decision content PsV higher, promptly be set at value near upper limit threshold PssH.In addition, decision content PsV also can change based on extraneous gas temperature T a.For example, externally gas temperature Ta higher the zone in can set decision content PsV higher.And, also can change decision content PsV based on vehicle velocity V s or compressor rotary speed Nc, extraneous gas temperature T a.
Be judged to be variable displacement compressor 100 when being in state with the running of maximum discharge capacity by discharging capacity identifying unit 424, driving load calculation unit 425 and use first to drive load calculation formula Tr1 and calculate torque as the driving load of variable displacement compressor 100.By discharging capacity identifying unit 424 when being judged to be variable displacement compressor 100, drive load calculation unit 425 and use second to drive load calculation formula Tr2 and calculate torque as the driving load of variable displacement compressor 100 with controlled discharge capacity action.
In the driving load calculation that drives load calculation unit 425, as shown in Figure 8, use the target suction pressure Pss that configures by target suction pressure setup unit 420, the pressure P d that calculates by head pressure computing unit 421, the degree of superheat SH that calculates by degree of superheat computing unit 422, infer the pressure P s in the suction pressure zone of inferring out unit 423 by suction pressure, by extraneous gas temperature transducer 404 detected extraneous gas temperature T a, by evaporator fan voltage detection unit 406 detected voltage Vf, and by the such external information of engine rotation speed sensor 408 detected compressor rotary speed Nc.
First drive pressure P d that load calculation formula Tr1 comprises the discharge pressure region that is calculated by head pressure computing unit 421, infer the pressure P s in the suction pressure zone of inferring out unit 423 as variable, as the formula (4) by suction pressure.In the formula (4), n is polytropic index (being 1.03 when the R134a refrigeration agent), and η is a volumetric efficiency, and Vc is that the maximum of variable displacement compressor 100 is discharged capacity, and Tloss is a mechanical loss.
Mathematical expression 1
Tr 1 = n n - 1 · η · Vc · Ps · { ( Pd Ps ) n - 1 n - 1 } + Tloss . . . ( 4 )
The pressure difference of the target suction pressure Pss that second drive pressure P d that load calculation formula Tr2 comprises the discharge pressure region that is calculated by head pressure computing unit 421, is configured by target suction pressure setup unit 420 and the pressure P d of discharge pressure region and target suction pressure Pss is as variable, as the formula (5).
Mathematical expression 2
Tr 2 = n n - 1 · { k 1 · ( Pd - Pss ) 2 + k 2 · ( Pd - Pss ) + k 3 } · Pss Nc · { ( Pd Pss ) n - 1 n - 1 } + Tloss . . . ( 5 )
In formula (5), braces surrounds comprises the pressure difference of the pressure P d of discharge pressure region and the target suction pressure Pss quadratic polynomial as variable, is equivalent to refrigerant cycle weight.K1, k2, k3 are coefficients.
As the torque of the driving load of the variable displacement compressor 100 that is calculated by formula (4) or formula (5), exporting motor 114 to is motor ECU, optimum and be utilized in order to make engine control.
In addition, as the torque of the driving load of the variable displacement compressor 100 that calculates by formula (4), (5), export in the control panel of the aircondition in the compartment, dispose in the instrument front of speed measuring instrument etc. or be arranged on display unit 460 in the navigation system.
Display unit 460 is when second drives load calculation formula Tr2 input and drive load signal, when promptly being judged to be variable displacement compressor 100 with controlled discharge capacity action by the capacity of discharge identifying unit 424, for example shows " ECO " energy-conservation mark such as character.460 couples of users of display unit identify capacity control drive 200 and variable displacement compressor 100 with power save mode work with for example can making its vision.
In addition, discharge capacity identifying unit 424 also can be based on from the signal of the flow transducer of the refrigerant flow that detects circulation road 12, from the signal of the differential pressure transducer of the pressure difference between 2 pressure monitoring points that detect circulation road 12 or offer the discharge capacity control signal of the capacity control drive that comprises the mechanical differential pressure detection unit that detects the pressure difference between 2 pressure monitoring points, the operating condition of judgement variable displacement compressor 100.
Fig. 9～Figure 14 represents other mode of executions of the capacity control system of variable displacement compressor involved in the present invention.In the present embodiment, expression is used for the capacity control system A of variable displacement compressor involved in the present invention the situation of the refrigeration cycle of automotive air conditioning system.
Fig. 9 represents the variable displacement compressor 100 of the employed ramp type of capacity control system A of present embodiment.The variable displacement compressor 100 of this no-clutch type comprises the different capacity control drive 300 of capacity control drive 200 structures with the variable displacement compressor 100 of before mode of execution.In addition, because the structure of the main body of compressor 100 is identical with the variable displacement compressor 100 of before mode of execution, so omit its explanation.
As shown in figure 10, this capacity control drive 300 is made of valve cell and the driver element that makes valve cell open the work of closing.Valve cell has valve casing 301 cylindraceous, and an end of valve casing 301 is formed with the valve opening 301a of double as ingress port.This valve opening 301a is communicated with discharge chamber 142 by the upstream side part of air feed path 160, and towards valve chamber 303 openings that go out in valve casing 301 internal separation.
Contain columned spool 304 in the valve chamber 303.Spool 304 can move by the axial direction along valve casing 301 in valve chamber 303, by with the end face butt of valve casing 301 just can inaccessible valve opening 301a.That is, the end face of valve casing 301 plays the effect of valve seat.
In addition, valve casing 301 outer circumferential faces are formed with outlet port 301b, and outlet port 301b is communicated with crank chamber 105 by the downstream side part of air feed path 160.Outlet port 301b, discharges chamber 142 and can be communicated with crank chamber 105 via valve opening 301a, valve chamber 303 and outlet port 301b also towards valve chamber 303 openings.
On the other hand, driver element is a solenoid unit 315, another distolateral binding of solenoid unit 315 and valve casing 301.Solenoid unit 315 comprises: with the solenoid cover cylindraceous 310 of valve casing 301 coaxial bindings, with end caps 312 solenoid cover 310 and opening end obturations valve casing 301 opposition sides.
On the axle center of this solenoid cover 310, dispose the sleeve that the round-ended cylinder shape is arranged 320 that becomes at valve casing 301 side openings.Contain fixed iron core 318 in part from the opening end of sleeve 320 to central authorities.Form containing space 324 unshakable in one's determination between the dead end of end cap 312 sides of sleeve 320 and fixed iron core 318, unshakable in one's determination 322 can be housed in containing space 324 unshakable in one's determination vertically movably.
The inserting hole 318a that is positioned at the axle center at fixed iron core 318 has been mounted slidably solenoid rod 326.End to the outstanding solenoid rod 326 of valve chamber 303 links with spool 304 one, fixes with the penetration hole that is formed at movable core 322 is chimeric to the other end of the outstanding solenoid rod 326 of containing space unshakable in one's determination 324.In view of the above, movable core 322 moves integratedly with solenoid rod 326.
Dispose open spring 328 between the end face of the central stepped of movable core 322 and fixed iron core 318, guarantee that predetermined gap is arranged between fixed iron core 318 and the movable core 322.
Dispose the coil 316 that is covered by resinous covering 314 around the sleeve 320 in solenoid cover 310.Solenoid cover 310, end cap 312, fixed iron core 318 and movable core 322 are all formed by magnetic material, constitute magnetic circuit.Sleeve 320 is formed by the stainless steel-like material of nonmagnetic substance.
Solenoid cover 310 is formed with pressure-sensitive port 310a, and pressure-sensitive port 310a is communicated with suction chamber 140 by pressure-sensitive path 166.The outer circumferential face of fixed iron core 318 is formed with the pressure-sensitive groove 318b that extends along axis direction, and pressure-sensitive mouth 310a and pressure-sensitive groove 318b are interconnected.
By pressure-sensitive port 310a and pressure-sensitive groove 318b suction chamber 140 is communicated with movable core containing space 324, the pressure of suction chamber 140 (hereinafter referred to as suction pressure Ps) closes the back side effect of the power of valve direction at spool 304 by solenoid rod 326 conducts in view of the above.
Be connected with the control gear 350 that is arranged at variable displacement compressor 100 outsides at this solenoid unit 315.If provide the control electric current I from control gear 350 to solenoid unit 315, then solenoid unit 315 produces electromagnetic force F (I).The electromagnetic force F of this solenoid unit 315 (I) attracts movable core 322 towards fixed iron core 318, make spool 304 close valve work.
In this capacity control drive 300, distolateral pressure (hereinafter referred to as the head pressure Pd) effect of discharging chamber 142 arranged at one of spool 304, pressure (hereinafter referred to as the suction pressure Ps) effect of suction chamber 140 is arranged in a side opposite with spool 304 of solenoid rod 326.Therefore, spool 304 works as the pressure-sensitive parts.
The sectional area of the solenoid rod 326 of the compression area (being called sealing area Sv) of spool 304 in the time of herein, also can be with spool 304 close valve orifice 301a, unshakable in one's determination 318 the inserting hole 318a supporting of being fixed forms identically.At this moment, spool 304 evolution to and any direction that closes direction all effect the pressure (hereinafter referred to as crank press) of crank chamber 105 is arranged.
Therefore, if the power of giving all the time to the valve opening position of spool 304 from spring 328 is fs, then act under this situation on the spool 304 power as the formula (6), this formula (6) distortion is become formula (7).
Sv·(Pd-Ps)+fs-F(I)＝0···(6)
Ps＝-(1/Sv)·F(I)+Pd+(fs/Sv)···(7)
Can know from formula (7),, then can determine suction pressure Ps if head pressure Pd, electromagnetic force F (I), promptly control electric current I decision.
That is,, and know the information of the head pressure Pd of change, then can calculate electromagnetic force F (I) and promptly control electric current I if preestablish target suction pressure Pss as controlling object.If based on the energising amount of this calculated value adjustment, then can make spool 304 actions in the mode of keeping target suction pressure Pss and adjust crank press Pc to solenoid unit 315.That is, can discharge volume controlled.
Like this suction pressure Ps is being maintained in the control of target suction pressure Pss,,, suction pressure Ps can be controlled at the scope from Pdmin to Pdmax according to the height of head pressure Pd suc as formula (7) and shown in Figure 11.That is, the suction pressure control range is slided to the high pressure side, in view of the above, even also can discharge volume controlled in the higher zone of thermal load.
In addition, can know from formula (7), if set sealing area Sv less, then can enlarge the control range of the suction pressure Ps of head pressure Pd arbitrarily with less electromagnetic force F (I), can bring into play the control range of described suction pressure Ps slip, with the multiplier effect of the amplification of this control range, can significantly enlarge the control range of suction pressure Ps.
In addition, be zero as if energising amount to solenoid unit 315, then owing to the power of giving all the time from spring 328 to spool 304, spool 304 is to the valve opening position action, and valve opening 301a is open.In view of the above, discharge that gas is imported into crank chamber 105 and the discharge capacity maintains minimum.
Figure 12 is the block diagram of schematic configuration that expression comprises the capacity control system A of control gear 350.In comprising the capacity control system A of this control gear 350,, therefore, only the part different with the capacity control system A of before mode of execution described because the capacity control system A of its most of structure and before mode of execution repeats herein.
Comprise that target suction pressure setup unit 351 that the capacity control system A of control gear 350 comprised based on the deviation of the vaporizer target outlet air temperature Tes that is configured by vaporizer target temperature setup unit 401 with the evaporator air outlet temperature Te that is gone out by evaporator temperature sensor 402 actual detected, sets the target suction pressure Pss as control target.
Equally, comprise that control signal computing unit 352 that the capacity control system A of control gear 350 is comprised utilizes the calculating formula of regulation, according to target suction pressure Pss, by the head pressure Pd that head pressure computing unit 421 calculates, calculate energising amount to solenoid 315.
Below, the action (using method) of above-mentioned capacity control system A is described.
Figure 13 be expression control gear 350 the suction pressure control action, be the flow chart of the program carried out of control gear 350.
This program is for example started when the engine key of vehicle becomes open mode, at first sets initial conditions (S100).
Next, read in the head pressure Pd (S101) that calculates by head pressure computing unit 421.
Then, whether marker for determination F1 is 0 (S102).Because F1=0 in the initial conditions, so the result of determination of S102 is a "Yes".Therefore, timer initiation (S103), flag F 1 is set at 1 (S104).
Next, in target suction pressure setting program S105, set target suction pressure Pss as controlling object.Afterwards, based on this target suction pressure Pss and the head pressure Pd that calculates by head pressure computing unit 421, calculate, promptly control electric current I (S106) to the energising amount of solenoid unit 315.The control electric current I uses formula (6) to calculate.In addition, the Ps substitution target suction pressure Pss in formula (6).
Compare to determine the control electric current I that calculates by this whether more than pre-set lower limit I1 (S107).If result of determination is a "No", then read in lower limit I1 as control electric current I (S108), this control electric current I exports solenoid unit 315 (S109) to as the control electric current.
On the other hand, if the result of determination of S107 is a "Yes", then compare to determine by the control electric current I that calculates whether below pre-set CLV ceiling limit value I2 (S110).CLV ceiling limit value I2 is bigger than lower limit I1.If result of determination is a "No", then read in CLV ceiling limit value I2 as control electric current I (S111), this control electric current I exports solenoid unit 315 (S109) to as the control electric current.
Therefore, if the result of the judgement of S107 and S110 is I1≤I≤I2, then former state is exported the control electric current I that calculates in S106.
In addition, in secondary flow process, because F1=1, so the result of determination of S102 is "No", judges whether the transit time of timer arrives stipulated time t1 (S112).If result of determination is a "Yes", promptly no show stipulated time in the transit time t1 of timer then sucks based on the target that configured last time and presses Pss and current head pressure Pd, calculates the control electric current I (S106) to solenoid unit 315.After S106,, carry out the processing of S107～S111 with for the first time identical.
On the other hand, if the result of determination of S112 is a "No", promptly the transit time of timer arrives stipulated time t1, then timer is resetted (S113), makes flag F 1 become 0 (S114).
That is, in the control of the suction pressure of control gear 350, read in to keeping target all the time and suck the head pressure Pd that presses Pss, correspondingly adjust control electric current I to solenoid unit 315 with the head pressure Pd of this change.Target sucks presses Pss to upgrade every stipulated time t1.
Next, use Figure 14, target suction pressure setting program S105 is described.
At first, vaporizer target temperature setup unit 401 is set the evaporator air outlet temperature Tes as the target of the discharge volume controlled of variable displacement compressor 100, reads in evaporator air outlet temperature Tes (S200).
Next, read in, calculate the deviation delta T (S202) of the evaporator air outlet temperature Te of vaporizer target outlet air temperature Tes and reality by temperature transducer 402 detected evaporator air outlet temperature Te (S201).
Then, based on the deviation delta T that calculates, utilize the calculating formula of regulation, the calculating formula that for example PI controls the regulation of usefulness to calculate target suction pressure Pss (S203).
Compare to determine the target suction pressure Pss that calculates by this whether more than pre-set lower limit Ps1 (S204).If result of determination is a "No", then lower limit Ps1 is read into (S205) as target suction pressure Pss.Whether if the result of determination of S204 is a "Yes", then comparing to determine by the target suction pressure Pss that calculates is below the pre-set CLV ceiling limit value Ps2 (S206).CLV ceiling limit value Ps2 is bigger than lower limit Ps1.If result of determination is a "No", then CLV ceiling limit value Ps2 is read into (S207) as target suction pressure Pss.If the result of the judgement of S204 and S206 is Ps1≤Pss≤Ps2, then the calculated value former state in S203 is read into as target suction pressure Pss.
Like this, in the air-conditioning control that comprises the related control gear of present embodiment 350, based on deviation delta T target setting suction pressure Pss, control discharge capacity makes evaporator air outlet temperature Te near vaporizer target outlet air temperature Tes.In addition, vaporizer target outlet air temperature Tes suitably changes according to the air-conditioning state in the compartment.
In addition, if know extraneous gas humidity, refrigeration cycle 10 the high-pressure area pressure or be equivalent to its temperature, refrigeration cycle 10 the area of low pressure pressure or be equivalent in its temperature, sunshine amount, the various settings of aircondition (the vaporizer air output is set, inside and outside gas switches a door set positions, vehicle interior temperature settings, blow-off outlet set positions, mix damper positions and set), the interior humidity of car, evaporator inlet air temperature and humidity, the compartment each surface temperature etc., then can improve the precision of inferring of thermal load.Therefore, more satisfactoryly be to use thermal load detection unit such as humidity transducer in extraneous gas humidity transducer and the compartment.
In the above-described embodiment, by to infer the suction pressure Ps that infers out unit 423 by suction pressure, upper limit threshold PssH and lower threshold PssL that target suction pressure Pss is set as benchmark compare, and judge that variable displacement compressor 100 is the states that are in the running of maximum discharge capacity; Or state with controlled discharge capacity running; But also can judge operating condition by the suction pressure Ps that infers and target suction pressure Pss are compared.In addition, set 2 upper limit threshold PssH and the lower threshold PssL as benchmark, but also can only set 1 threshold value, judge operating condition based on suction pressure Ps that infers and the threshold value that configures with target suction pressure Pss.That is, also can judge operating condition based on infer the suction pressure Ps and the target suction pressure Pss that infer unit 423 by suction pressure.
In the above-described embodiment, expression be that variable displacement compressor 100 is situations of clutchless compressor, but also can be the variable displacement compressor that magnetic clutch is installed.
In addition, in the above-described embodiment, what represent is that variable displacement compressor 100 is situations of the reciprocating compressor of ramp type, but also can use the variable displacement compressor of oscillation plate type, also can use the closed variable displacement compressor that is built-in with motor.
And, in the variable displacement compressor 100 of above-mentioned mode of execution, throttle valve member as for the path 162 of bleeding that improves the pressure limited flow in the crank chamber 105 adopt the fixed orifice 103c that is formed at valve plate 103, but the throttle valve member is not limited thereto.As the throttle valve member, for example also can adopt variable throttle valve or valve to come limited flow.
And, in above-mentioned capacity control system A, capacity control drive 200,300 is configured in and connects the air feed path 160 of discharging between chamber 142 and the crank chamber 105, but at variable displacement compressor 100 is under the situation of ramp type or oscillation plate type, can capacity control drive 200 (300) be disposed at air feed path 160 yet, and capacity control drive 200,300 is disposed in the path 162 of bleeding between connecting crank chamber 105 and the suction chamber 140.That is, being not limited to the inlet control of control air feed path 160 apertures, can also be the control of export of controlling path 162 apertures of bleeding.
And above-mentioned capacity control system A also goes for the variable displacement compressor of eddy type or blade type.Promptly, use spool to be subjected to the capacity control drive of head pressure, suction pressure and solenoidal electromagnetic force effect, if be used to make the pilot pressure (being the pressure of crank chamber when reciprocal compressor) of discharging volume change to change, then capacity control system A can be useful in all variable displacement compressors according to the valve opening of capacity control drive.
And the capacity control system A of variable displacement compressor involved in the present invention can also be applicable to the various refrigeration cycle such as refrigeration cycle of indoor air-conditioning system except that automotive air conditioning system.Capacity control system A not only goes for R134a or the carbon dioxide refrigeration cycle as refrigeration agent, goes for using the refrigeration cycle of the new refrigerant beyond R134a or the carbon dioxide.

Claims (25)

1. the capacity control system of a variable displacement compressor, described variable displacement compressor presss from both sides the circulation road that inserts in for refrigerant cycle for the refrigeration cycle that constitutes air-conditioning system with radiator, expander and vaporizer, capacity is based on the variation of pilot pressure and change
Be that pressure with the described refrigeration agent of the random position of the discharge pressure region of described refrigeration cycle is head pressure, and be suction pressure with the pressure of the described refrigeration agent of the random position in the suction pressure zone of described refrigeration cycle,
Comprise: capacity control drive, described capacity control drive can be by changing described pilot pressure to adjust the capacity of described variable displacement compressor;
External information detection unit, described external information detection unit are used to detect the external information 1 or more relevant with described refrigeration cycle; And
Target suction pressure setup unit, described target suction pressure setup unit be based on by the detected external information of described external information detection unit, and the pressure in described suction pressure zone is come the target setting suction pressure as controlling object,
Described pilot pressure is changed adjust from the discharge capacity of the refrigeration agent of described variable displacement compressor discharge, so that the pressure in described suction pressure zone becomes described target suction pressure,
The capacity control system of described variable displacement compressor is characterised in that,
Comprise: suction pressure is inferred the unit, described suction pressure is inferred the unit based on by the detected external information of described external information detection unit, infers at the pressure of described variable displacement compressor with the described suction pressure zone under the state of maximum discharge capacity action; And
Discharge capacity identifying unit, described discharge capacity identifying unit is based on pressure of being inferred the described suction pressure zone of inferring out the unit by described suction pressure and the target suction pressure that configured by described target suction pressure setup unit, judge that described variable displacement compressor is to move with maximum discharge capacity, still described variable displacement compressor is moving with controlled discharge capacity.
2. the capacity control system of variable displacement compressor as claimed in claim 1 is characterized in that,
Described discharge capacity identifying unit compares the pressure of being inferred the described suction pressure zone of inferring out the unit by described suction pressure, the target suction pressure that is configured by described target suction pressure setup unit,
When the pressure of being inferred the described suction pressure zone of inferring out the unit by described suction pressure is higher than the target suction pressure that is configured by described target suction pressure setup unit, is judged to be described variable displacement compressor and is moving with maximum discharge capacity;
When the pressure of being inferred the described suction pressure zone of inferring out the unit by described suction pressure is lower than the target suction pressure that is configured by described target suction pressure setup unit, is judged to be described variable displacement compressor and is moving with controlled discharge capacity.
3. the capacity control system of variable displacement compressor as claimed in claim 1 is characterized in that,
Described target suction pressure setup unit comes setting threshold with described target suction pressure as benchmark,
Described discharge capacity identifying unit compares the pressure of being inferred the described suction pressure zone of inferring out the unit by described suction pressure, the threshold value that is configured by described target suction pressure setup unit,
When the pressure in described suction pressure zone is higher than described threshold value, is judged to be described variable displacement compressor and is moving with maximum discharge capacity;
When the pressure in described suction pressure zone is lower than described threshold value, is judged to be described variable displacement compressor and is moving with controlled discharge capacity.
4. the capacity control system of variable displacement compressor as claimed in claim 1 is characterized in that,
Described target suction pressure setup unit comes capping threshold value and lower threshold with described target suction pressure as benchmark,
Described discharge capacity identifying unit compares the pressure of being inferred the described suction pressure zone of inferring out the unit by described suction pressure, described upper limit threshold and the lower threshold that is configured by described target suction pressure setup unit,
When the pressure in described suction pressure zone is higher than described upper limit threshold, is judged to be described variable displacement compressor and is moving with maximum discharge capacity;
When the pressure in described suction pressure zone is lower than described lower threshold, is judged to be described variable displacement compressor and is moving with controlled discharge capacity.
5. the capacity control system of variable displacement compressor as claimed in claim 4 is characterized in that,
Under the pressure in described suction pressure zone is in situation between described upper limit threshold and the described lower threshold,
Pressure in described suction pressure zone is to be set in decision content between described upper limit threshold and the described lower threshold when above, and described discharge capacity identifying unit is judged to be described variable displacement compressor and is moving with maximum discharge capacity;
At the pressure in described suction pressure zone during less than described decision content, described discharge capacity identifying unit is judged to be described variable displacement compressor with controlled discharge capacity action.
6. the capacity control system of variable displacement compressor as claimed in claim 5 is characterized in that,
Make described decision content variable according to external information, described external information is detected by the rotation speed detection unit of the described external information detection unit of conduct of the physical quantity of the speed of a motor vehicle detection unit of the described external information detection unit of conduct that detects the speed of a motor vehicle and/or the rotating speed that detection is equivalent to described variable displacement compressor.
7. the capacity control system of variable displacement compressor as claimed in claim 5 is characterized in that,
Make described decision content variable according to external information, described external information is detected by the thermal load detection unit as described external information detection unit.
8. as the capacity control system of each described variable displacement compressor in the claim 1 to 7, it is characterized in that,
Described suction pressure is inferred the unit and is inferred the pressure in described suction pressure zone based on external information, and described external information is by the head pressure computing unit of the described external information detection unit of conduct of the pressure of the discharge pressure region of calculating described variable displacement compressor, detect as the thermal load detection unit of described external information detection unit, the described rotation speed detection unit of the described external information detection unit of conduct that detects the physical quantity of the rotating speed that is equivalent to described variable displacement compressor.
9. the capacity control system of variable displacement compressor as claimed in claim 8 is characterized in that,
Described head pressure computing unit calculates the pressure of described discharge pressure region based on external information, and described external information is detected by the pressure sensing cell that detects from the discharge pressure region of described variable displacement compressor to the pressure of the high-pressure area of the expander of refrigeration cycle.
10. the capacity control system of variable displacement compressor as claimed in claim 9 is characterized in that,
Comprise temperature automatic expansion valve as described expander, and comprise the degree of superheat computing unit based on the degree of superheat of the exit region that is calculated described vaporizer by the detected external information of described pressure sensing cell, described suction pressure is inferred described suction pressure zone is inferred in the unit based on the external information that is calculated by described degree of superheat computing unit pressure.
11. the capacity control system of variable displacement compressor is characterized in that as claimed in claim 8 or 9,
Comprise the degree of superheat detection unit of the described external information detection unit of conduct of the degree of superheat that detects the suction pressure zone of described variable displacement compressor from the exit region of described vaporizer, described suction pressure is inferred the unit based on the pressure of being inferred described suction pressure zone by the detected external information of described degree of superheat detection unit.
12. the capacity control system as each described variable displacement compressor in the claim 3 to 11 is characterized in that,
The pressure difference of the described target suction pressure of threshold value, upper limit threshold or lower threshold that is configured by described target suction pressure setup unit and the benchmark that becomes threshold value, upper limit threshold or lower threshold changes based on this target suction pressure.
13. the capacity control system as each described variable displacement compressor in the claim 1 to 12 is characterized in that,
The driving load calculation unit that comprises the driving load of calculating described variable displacement compressor, be judged to be described variable displacement compressor when moving with maximum discharge capacity at described discharge capacity identifying unit, described driving load calculation unit drives the driving load that the load calculation formula is calculated described variable displacement compressor with first; Be judged to be described variable displacement compressor when moving with controlled discharge capacity at described discharge capacity identifying unit, described driving load calculation unit drives the driving load that the load calculation formula is calculated described variable displacement compressor with second.
14. the capacity control system of variable displacement compressor as claimed in claim 13 is characterized in that,
The first driving load calculation formula of described driving load calculation unit comprises by the pressure of the described discharge pressure region of described head pressure computing unit calculating, infers the pressure in the described suction pressure zone of inferring the unit as variable by described suction pressure.
15. the capacity control system as claim 13 or 14 described variable displacement compressors is characterized in that,
The described target suction pressure that second of described driving load calculation unit drives pressure that the load calculation formula comprises the described discharge pressure region of being calculated by described head pressure computing unit, set by described target suction pressure setup unit is as variable.
16. the capacity control system as each described variable displacement compressor in the claim 13 to 15 is characterized in that,
Second of described driving load calculation unit drives the pressure difference of load calculation formula pressure that comprises the described discharge pressure region of being calculated by described head pressure computing unit and the described target suction pressure of being set by described target suction pressure setup unit as variable.
17. the capacity control system of a variable displacement compressor, described variable displacement compressor presss from both sides the circulation road that inserts in for refrigerant cycle for the refrigeration cycle that constitutes air-conditioning system with radiator, expander and vaporizer, capacity is based on the variation of pilot pressure and change
Comprise: capacity control drive, described capacity control drive is a head pressure with the pressure of the described refrigeration agent of the random position of the discharge pressure region of described refrigeration cycle, and when being suction pressure with the pressure of the described refrigeration agent of the random position in the suction pressure zone of described refrigeration cycle, have and be subjected to described head pressure and be subjected to described suction pressure and solenoidal electromagnetic force in the direction relative with described head pressure, can make valve opening open the spool of closing, can be by described valve opening being opened close and being made described pilot pressure change the capacity of adjusting described variable displacement compressor;
External information detection unit, described external information detection unit are used to detect the external information 1 or more relevant with described refrigeration cycle; And
Target suction pressure setup unit, described target suction pressure setup unit be based on by the detected external information of described external information detection unit, and the pressure in described suction pressure zone is come the target setting suction pressure as controlling object,
Based on the aperture of adjusting described capacity control drive by the detected external information of described external information detection unit, described pilot pressure is changed, adjust in view of the above from the discharge capacity of the refrigeration agent of described variable displacement compressor discharge,
The capacity control system of described variable displacement compressor is characterised in that, comprising:
The head pressure computing unit, described head pressure computing unit is based on the pressure that is calculated the discharge pressure region of described variable displacement compressor by the detected external information of described external information detection unit;
The control signal computing unit, described control signal computing unit calculates the discharge capacity control signal based on the pressure of the described discharge pressure region that is calculated by described head pressure computing unit and by the target suction pressure that described target suction pressure setup unit configures;
The solenoid-activated unit, described solenoid-activated unit provides electric current based on the discharge capacity control signal that is calculated by described control signal computing unit to the solenoid of described capacity control drive;
Discharge capacity identifying unit, described discharge capacity identifying unit is judged the discharge capacity of described variable displacement compressor; And
Drive the load calculation unit, the driving load that described driving load calculation unit calculates described variable displacement compressor.
18. the capacity control system of variable displacement compressor as claimed in claim 17 is characterized in that,
Be judged to be described variable displacement compressor when moving with maximum discharge capacity at described discharge capacity identifying unit, described driving load calculation unit drives the driving load that the load calculation formula is calculated described variable displacement compressor with first; Be judged to be described variable displacement compressor when moving with controlled discharge capacity at described discharge capacity identifying unit, described driving load calculation unit drives the driving load that the load calculation formula is calculated described variable displacement compressor with second.
19. the capacity control system as each described variable displacement compressor in the claim 13 to 18 is characterized in that,
Described driving load calculation unit will export the vehicle side engine controlling unit to by the driving load of the described variable displacement compressor that calculates.
20. the capacity control system as each described variable displacement compressor in the claim 1 to 19 is characterized in that,
Described variable displacement compressor comprises:
Shell, described shell are formed with in internal separation discharges chamber, crank chamber, suction chamber and cylinder thorax;
Piston, described piston are provided in described cylinder thorax;
Live axle, described live axle rotatably are supported in the described shell;
It is the variable swash plate member in reciprocating angle of inclination of described piston that shifting mechanism, described shifting mechanism comprise the rotation transformation of described live axle;
The air feed path, described air feed path is communicated with described discharge chamber and described crank chamber; And
The path of bleeding, the described path of bleeding is communicated with described suction chamber and described crank chamber,
Described capacity control drive folder inserts in the side in described air feed path and the described path of bleeding.
21. a display unit is used for the capacity control system of each described variable displacement compressor of claim 1 to 12, described display unit is characterised in that,
Be judged to be described variable displacement compressor when moving at described discharge capacity identifying unit, can be used as visual information identification ground and show the energy conservation state with controlled discharge capacity.
22. display unit, the refrigeration cycle that is used for air-conditioning system, described refrigeration cycle is by disposing radiator, expander and vaporizer in the circulation road of refrigerant cycle, and configuration capacity based on the variation of pilot pressure and the variable displacement compressor that changes form, described display unit is characterised in that, the capacity control system that is used for variable displacement compressor
Described capacity control system comprises: can be by described pilot pressure being changed adjust the capacity control drive of the capacity of described variable displacement compressor; Be used to detect the external information detection unit of the external information 1 or more relevant with described refrigeration cycle; Based on by the detected external information of described external information detection unit, the pressure in described suction pressure zone is come the target suction pressure setup unit of target setting suction pressure as controlling object; And the driving load calculation unit that calculates the driving load of described variable displacement compressor,
To can be used as visual information identification ground from the driving load signal of described driving load calculation unit shows.
23. display unit as claimed in claim 22 is characterized in that,
The capacity control system of described variable displacement compressor comprises the discharge capacity identifying unit of the discharge capacity of judging variable displacement compressor.
24. display unit as claimed in claim 23 is characterized in that,
Described discharge capacity identifying unit judges it is the state of described variable displacement compressor with the action of maximum discharge capacity, or described variable displacement compressor is with the state of controlled discharge capacity action.
25. as claim 23 or 24 described display unit, it is characterized in that,
Be judged to be described variable displacement compressor when moving at described discharge capacity identifying unit, can be used as visual information identification ground and show the energy conservation state with controlled discharge capacity.
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